* {
    margin: 0;
    padding: 0;
}

body, html {
    width: 100%;
    height: 100%;
    background-color: #333;
    font: 500 16px/20px 'Microsoft YaHei UI';
    color: red;
}

div {
    box-sizing: border-box;
}

::-webkit-scrollbar {
    width: 5px;
    background-color: transparent;
}

/*定义滚动条轨道 内阴影+圆角*/
::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    background-color: transparent;
}

/*定义滑块 内阴影+圆角*/
::-webkit-scrollbar-thumb {
    border-radius: 10px;
    -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, .3);
    background-color: transparent;
}

.clearfix::after {
    content: '';
    display: block;
    visibility: visible;
    clear: both;
    height: 0;
    line-height: 0;
}

.clearfix {
    zoom: 1;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

li {
    list-style: none;
}